Well, if wd doesn't start with a /, then there will be no initial / to
strip. Looking at the code, it seems like create() actually does
strip initial /'s from wd, which was presumably the initial attempt to
support chroot. But that didn't really work, since combine_path(wd,
file) will still start with a slash if file does... Hence the
stripping in other (but not all necessary) places, which rendered the
stripping in create() unneccessary although nobody seems to have
removed it. Quite a mess... :-/
In fact, stripping the intial / of wd seems like a very bad idea.
Consider if the intended wd is "/foo".
combine_path("/foo", "../../bar") => "/bar", but
combine_path("foo", "../../bar") => "../bar".
So if you strip the / from wd, you will be able to ascend above the
chroot by using .., but that will not happen if you keep the / in wd
and strip it from full instead.
